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A047738 Earliest sequence of 4 consecutive economical numbers. 1
179210312, 179210313, 179210314, 179210315 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..4.

Tanya Khovanova, Non Recursions

J.-M. De Koninck and F. Luca, On strings of consecutive economical numbers of arbitrary length

Eric Weisstein's World of Mathematics, Economical Number

EXAMPLE

179210312 = 2^3* 4733^2; 9 digits in 179219312, 7 digits in its prime factorization, 7 < 9, so that number is economical.

CROSSREFS

Cf. A046759.

Sequence in context: A213966 A206520 A127955 * A079323 A228760 A204529

Adjacent sequences:  A047735 A047736 A047737 * A047739 A047740 A047741

KEYWORD

fini,full,nonn,base

AUTHOR

Carlos Rivera

STATUS

approved

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Last modified September 25 18:20 EDT 2017. Contains 292499 sequences.